Rca 19"bw 1965 kcs 149aa video bars??

[jeffilm]

I Have a beautiful RCA 19" remote controlled portable black and white tv with the KCS 149AA chassis. It has a like new crt. It has one problem I can't locate. The background has has dark vertical striping (Please see the attached photo). At first I thought it was yoke ringing. I substituted the yoke with no new results.
I replaced the Horizontal output, damper and video out recapped the electrolytics and film capacitors. That took care of other minor issues. It originally had very bad horizontal linearity. The middle was squished and the left was 150% of the right side and the linearity coil did nothing. A bad cap in that circuit took care of that problem. The cage around the flyback is all there. I was thinking there was radiation into the video section. Could the flyback be of fault?
It runs cool and current draw is normal. It's a very uneven pattern. The ringing of yokes is even usually on the left only with notable jagged scan lines. Has anyone run into this before? I have earlier set with the KCS 143 chassis which is basically the same but is series strung. It doe not have this issue.The set produces a great picture otherwise. Any help would be greatly appreciated. Thanks...Jeff

KCS 149AA VIDEO RINGING.jpg